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Re: What needs changed or fixed if my 91 ninety eight...
MANY possibilities! Assuming that your security light is not staying on--First, you must determine if it/s a no spark or a no fuel condition and take it from there.....
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Possible faulty crank sensor or idle speed controller, fuel pump relay, or ignition module. Get a data scan and see what's sensor might out of range or defective. Check for clogged fuel filter also.
The spark and fuel both get there reference from the crank shaft sensor , so as long as the crankshaft is turning and the sensor and module are good you will have spark and fuel, it sounds like one thing you are missing is compression I think you should see if you have lost a timing chain, does the engine seam to be turning over at a very fast speed? pull a spark plug and check for compression.....SORRY TO BE THE BEARER OF BAD NEWS
cam sensor is only half of the cam circuit, the other half of the cam circuit is the magnet on the timing chain. the cam sensor reads from the magnet every time the engine completes a revolution, what happens is the magnet on the chain will break into smaller piece which makes the sensor harder to read every time the engine make a complete revolution. most likely you'll need to replace the timing chain to fix this.
I had the same thing happen on a 91 Olds 88. Replaced crank shaft position sensor, coil, and ignition module. That solved the problem. I think the culprit was the CSP Sensor, but changed all three so can't say for sure.
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